package train48days;


import java.util.Scanner;

public class 找假币 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        while (sc.hasNext()){
            int n =sc.nextInt();
            if (n==0){
                return;
            }
            int count = 0;
//            while (n>1){
//                n=n/3;
//                count++;
//                }
            while (n>=2){
                n = (int) Math.ceil((double) n/3);
                count++;
            }
            System.out.println(count);
        }
    }
}
